Multi-beamed optical pick-up

Details Multi-beamed optical pick-up Multi-beamed optical pick-up

1988-11-28

1991-06-11

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4424, 369110, 369112, 369 4437, 2502015, G11B 700, G11B 2736

Patent

active

050238604

ABSTRACT:
An optical disc system typically includes an optical disc and an optical pick-up for projecting a light beam for recording information. The optical pick-up or at least its objective lens is provided to be movable relative to the optical disc in a predetermined direction. The optical pick-up uses two light beams, one of which is for recording information on the disc and the other of which is for reproducing the information recorded on the disc immediately after it has been recorded for confirmation. In accordance with the present invention, it is so structured that a tracking error of the confirmation light beam on the disc is monitored and the light intensity of the confirmation light beam emitted from the light source is varied in accordance with the detected tracking error of the confirmation light beam on the disc.

REFERENCES:
patent: 4546463 (1985-10-01), Opheij et al.
patent: 4771414 (1988-09-01), Yoshimatsu
patent: 4823334 (1989-04-01), Tanaka et al.
patent: 4841512 (1989-07-01), Kubota et al.

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